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So, what I'm trying to do is have a main menu and then press a button, it loads a list of countries.

now I've seemed to have set it up right, no errors I can see, but the app crashes before I load this activity (the lists) the main menu is fine, and I added another button with a blank activity which loads just fine.

logCat is giving me these errors

E/ArrayAdapter: You must supply a resource ID for a TextView
D/AndroidRuntime: Shutting down VM    
                  java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView

and I'm not sure what it's asking for beyond the textView

heres my XML:

<ListView
    android:id="@+id/text1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="#f897"
    android:dividerHeight="1dp"
    android:listSelector="#0f0"/>

and my Java:

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class countries extends AppCompatActivity {

        ListView simpleList;
        String countryList[] = {"India", "China", "Australia", "Portugal", "USA","England", "NewZealand", "Germany", "France","South Africa"};


        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_countries);
            simpleList = (ListView)findViewById(R.id.text1);
            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, R.layout.activity_countries,  countryList);
            simpleList.setAdapter(arrayAdapter);
        }


}

any help?

SCB Gaming Presents
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3 Answers3

1

You array adapter expects the layout to be a TextView, but it look like R.layout.activity_countries is an activity layout?

dazza5000
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  • ah ok, so what do I need to change? – SCB Gaming Presents Feb 04 '18 at 23:16
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    new ArrayAdapter(this, R.layout.activity_countries, countryList); that line needs to be something like described here: https://guides.codepath.com/android/Using-an-ArrayAdapter-with-ListView – dazza5000 Feb 04 '18 at 23:21
  • hmm, so I'd need to have my array in another xml file? – SCB Gaming Presents Feb 04 '18 at 23:39
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    Your array can be in the java file, but the array you are using is expecting the layout to just be a textview. So you will need to use something like android.R.layout.simple_list_item_1 as the layout or use a different type of adapter. It is common to use recyclerview these days and not listview. – dazza5000 Feb 05 '18 at 04:52
  • this is what I'm not understanding though, where is simple_list_item_1 even coming from? I've not declared it anywhere and from that link I don't understand how to. – SCB Gaming Presents Feb 05 '18 at 08:29
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    It comes with the Android framework and is a default layout included on Android devices that all apps can access. – dazza5000 Feb 05 '18 at 14:13
1

You should create a custom adapter and custom view for each listview's row. Check it here: Custom Adapter for List View

Liar
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1

change:

 ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, R.layout.activity_countries,  countryList);

to:

 ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,  android.R.layout.simple_list_item_1,countryList);

your code not work because you use default ArrayAdapter with custom item layout

SonVi
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